JP5013981B2 - Underfloor mounting type air blower - Google Patents

Description

  The present invention relates to an underfloor-mounted air supply / air supply device that is installed in an underfloor space of a building and supplies air sucked from outside to the room, and particularly relates to an underfloor-mounted air supply / airflow device that facilitates maintenance. Is.

  Some ventilators that ventilate indoor air by supplying or exhausting air, for example, are installed in a ceiling space. Some ventilators are provided with an air filter that purifies the air supplied to the room. This type of prior art is disclosed in, for example, Patent Documents 1 and 2. Moreover, there exists a thing as shown in patent document 3 regarding the blower corresponding to underfloor air conditioning installed in the underfloor.

JP 09-203547 A Japanese Patent Laid-Open No. 10-267373 Japanese Patent Application Laid-Open No. 07-269916

  In this type of conventional ceiling-embedded air-conditioning ventilator, an air filter or a heat exchanger for purifying air is incorporated in the ventilator. And the ventilation apparatus which is a main-body part is installed in the space behind the ceiling. An inspection port for maintenance of the ventilation device is provided on the ceiling surface of the place where the ventilation device is installed. An air filter that requires relatively frequent maintenance, such as cleaning, can also be maintained by opening an inspection opening in the ceiling, and the air filter is detachable through the inspection opening. Such inspection ports are generally located at high places and require a stepladder or the like to open and close them. The work on the stepladder is unstable, and the inspection port of the ventilator installed in a narrow ceiling space must be opened and closed in an unstable state. As described above, the maintenance of the air filter is not easy and tends to be requested by a specialist.

  Moreover, the stopper which fixes the inspection cover which covers an inspection port is generally provided so that attachment or detachment is possible, and it may be dropped carelessly. Therefore, care must be taken when removing the inspection lid. Because of such annoyance, the maintenance of the air filter is often neglected, and the amount of supplied air may be reduced due to dust adhesion. Air filter contamination not only reduces the air supply flow rate, but also causes bacteria and molds that adhere to the air filter to spread on the air supply air, which can leave the room in an unsanitary environment. .

  Also, if it is used for a long time in the air supply duct, dirt will adhere. Cleaning the inside of the duct is a special work. For example, a method of transporting fine beads through the duct with a high-speed airflow has been put into practical use, but it is not widely used due to its high cost. In addition, maintenance such as removal of dust attached to the blades of the blower and replacement of the motor must be performed from the inspection port after removing the inspection lid and removing the heat exchanger. It gets in the way of work.

  Moreover, as for the thing provided with the insect net, the insect net is generally a left-right pull-out type, but depending on the installation location of the inspection port, it may be a groping work from the ceiling inspection port. In addition, when the insect net is a vertically extending type, dust or insects attached to the air filter may fall.

  Moreover, regarding the type of underfloor air-conditioning blower installed under the floor, no particular proposal has been made as improving the maintainability.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to provide an underfloor-mounted air supply system that can easily perform maintenance on a plurality of maintenance points including an air filter. It is to obtain a blower.

  In order to solve the above-described problems and achieve the object, an underfloor-mounted air supply and blower device of the present invention is provided. A floor-mounted air blower that is installed in the under-floor space of a building and supplies the air sucked from the outside to the room. It is installed under the under-floor inspection port formed on the floor, and the air supply path inside The main body box that forms the air supply path, the air supply path provided in the air supply path is moved, and the maintenance part is detachable from the main body box body so as to cross the air supply path The air supply channel that is provided in the air supply passage is filtered, and the filter device that is detachable from the main body box and the electric wiring and the electric wiring connection portion are housed, and are detachable from the main body box. The maintenance section of the blower, the filter device, and the electrical wiring connection box are detachably provided in the area inside the underfloor inspection port on the top plate facing the underfloor inspection port of the main body box. And wherein the are.

  According to the present invention, the filter device that requires relatively frequent maintenance is detachably housed on the upper surface of the air supply / air blower device that is installed within the reach of the hand just below the indoor floor inspection port. In addition, the filter device can be maintained. As a result, it is possible to suppress a decrease in the air supply amount and an unhygienic environment due to bacteria, mold, etc. in the room. Moreover, since the maintenance part of the air blower and the electrical wiring connection box is also detachably housed on the upper surface of the air supply air blower, maintenance of the filter device, the air blower, and the electrical wiring connection box can be performed from one underfloor inspection port.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an underfloor mounting type air supply and blower according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a system diagram of an air supply / air supply system including an underfloor mounted air supply / air supply device according to the present invention. FIG. 2 is a perspective view of the heat insulation structure excluding the upper top plate and the lower box body of the floor-mounted air supply and blower device as viewed from the upper surface side. FIG. 3 is a perspective view seen from the upper surface side of the underfloor mounting type air supply and blower. FIG. 4 is a perspective view showing a state in which the filter device is pulled out from the main body box for maintenance. FIG. 5 is a perspective view showing a state in which the filter device, the motor, and the electric wiring connection box are removed from the main body box. FIG. 6 is a plan view of the floor-mounted air supply and blower.

  In FIG. 1, the underfloor mounted air supply and blower 100 is installed in the underfloor space S2 of the building. The floor 4 that separates the indoor space S1 and the underfloor space S2 is provided with an underfloor inspection port 7 that is closed with an inspection lid. The inspection lid is detachable from the underfloor inspection port 7, and the underfloor mounting type air supply / air blowing device (hereinafter simply referred to as air supply / air blowing device) 100 is installed in the underfloor space S <b> 2 vertically below the underfloor inspection port 7. ing. The height of the air supply and blower 100 is set lower than the height of the underfloor space S2 by a predetermined amount. When the inspection lid is opened, the upper top plate 21 of the air supply / air blowing device 100 is positioned immediately below the underfloor inspection port 7. The supply air blower 100 blows out the supply air sucked from the outdoor space S4 to the indoor space S1.

  An outdoor opening 1 is formed on the outer wall that separates the outdoor space S4 and the ceiling space S3. And the 1st duct 2 for attracting | sucking air supply from outdoor space S4 is arrange | positioned between the outdoor opening 1 and the air supply air blower 100. FIG. On the other hand, an indoor outlet 6 is provided at a predetermined position on the floor 4 of the building. And the 2nd duct 3 for supplying supply air to indoor space S1 is arrange | positioned between the supply air blower 100 and the indoor blower outlet 6. FIG. The first duct 2 and the second duct 3 are configured so as to cover a heat insulating material such as resin cotton around a cylindrical body such as a vinyl chloride pipe. A portion of the first duct 2 and the second duct 3 exposed in the room is provided with a decorative cover (not shown) so as to cover these ducts.

  In the outdoor opening 1 on the side facing the outdoor space S4, a weather cover 9 on which a butterfly net is stretched is mounted for the purpose of suppressing the blowing of wind and rain and the intrusion of dust and insects. Further, for the purpose of suppressing the entry of dust and insects into the inside of the first duct 2, the flow path of the first duct 2 in the vicinity of the outer wall following the outdoor opening 1 has a flow path cross-sectional area locally than other parts. It is widened so that the flow rate in this part is slow.

  The above-described air supply / air supply system including the air supply / air supply device 100 forms an air supply system indicated by arrows in FIG. 1 from the outdoor opening 1 to the indoor air outlet 6 (in the figure, the thin ink arrows indicate the outside air). The white arrow indicates the air cleaned by the air supply and blower 100). An air supply path that is a part of the air supply system is formed inside the air supply / air blower 100.

  The air supply and blower 100 includes a main body box 20 constituting an outer shell, and a heat insulating structure 16 housed in the main body box 20. The main body box 20 further includes a substantially box-like lower box 22 having an upper surface as an opening, and an upper top plate 21 that closes the opening of the lower box 22. The lower box 22 is provided with a connection flange 14 for connecting the first duct 2 and a connection flange 15 for connecting the second duct 3. The heat insulating structure 16 is housed in the lower box 22 and forms an air supply path communicating with the connection flanges 14 and 15 inside. The air supply path is provided with a blower 25 that moves air in the air supply path and a filter device 10 that filters and cleans the air flowing through the air supply path.

  The lower box 22 of the main body box 20 is made of a steel plate, and as shown in FIG. 2, has a substantially cubic box shape with an open upper surface, and has a flange portion in the upper opening. The upper top plate 21 (not shown in FIG. 2) is fastened to the flange portion of the lower box 22 with a fixing screw. Inside the lower box 22 is accommodated a heat insulating structure 16 formed of a foam heat insulating material such as polystyrene foam. The heat insulating structure 16 forms an air supply path therein as indicated by an arrow in FIG. A bell mouth 17b in which the blower 25 is installed and a maintenance space 17d in which the filter device 25 is installed are formed on the air supply path.

  As shown in FIGS. 3 to 5, the blower 25 includes a motor 26 and a sirocco fan 27 attached to a drive shaft of the motor 26. The blower 25 is inserted through the blower insertion port 21 a formed at a position corresponding to the bell mouth 17 b on the top surface of the top top plate 21 with the drive shaft vertical, and fixes the motor mounting plate 28 a surrounding the motor 26. It is fastened with screws 28 b and fixed to the upper top plate 21. As shown in FIG. 5, the blower 25 can be removed vertically upward by removing the fixing screw 28b during maintenance. The blower 25 rotates the sirocco fan 27 in the bell mouth 17b to forcibly move the air in the air supply path.

  Further, the filter device 10 is inserted from the filter insertion port 19a of the maintenance cover 19 that closes the cleaning opening 21b formed at a position corresponding to the maintenance space 17d on the top surface of the upper top plate 21, and the main body box 20 Is attached. As shown in FIG. 4, the filter device 10 can be detached from the main body box 20 by pulling out vertically upward during maintenance. The maintenance cover 19 that closes the cleaning opening 21b (maintenance space 17d) is fixed in an airtight state to the cleaning opening 21b by rotary clamps 23 (engagement stop structures) provided at the four corners of the cleaning opening 21b. Yes. The maintenance cover 19 can be detached from the main body box 20 by rotating the clamp 23 by 90 ° when cleaning the inside of the main body box 20 (maintenance space 17d).

  The air filter 12 is produced by laminating several air filters such as a dust removing air filter and a high performance air filter, and is sandwiched between the filter frames 11 as shown in FIG. The filter frame 11 is an integrally molded product made of a resin-made frame portion that can be opened and closed by a self-hinge and a cover plate 13 having a flat area wider than the filter insertion port 19a of the maintenance cover 19, and the air filter 12 is sandwiched between the frame portions. The filter device 10 is installed in the maintenance space 17d so as to cross the air supply path, and filters the air flowing through the air supply path.

  The electrical wiring connection box 30 is fastened to the electrical wiring connection box mounting location 21c on the top surface of the upper top plate 21 with a fixing screw. Inside the electrical wiring connection box 30 are various wirings connected to the air supply and blower device 100 including the motor lead 26a (in this embodiment, wiring extending to a motor starting capacitor connected to the blower 25, etc. ) And its connection terminals. As shown in FIG. 5, the electrical wiring connection box 30 can be removed vertically upward by removing a fixing screw during maintenance such as replacement of the motor 26.

  In FIG. 6, the alternate long and short dash line indicates the size of the opening of the underfloor inspection port 7. The maintenance part (motor 26 and sirocco fan 27) of the blower 25 including the motor mounting plate 28a, the maintenance cover 19 including the filter device 10, the rotary clamp 23, and the electrical wiring connection box 30 are all the upper top plate of the main body box 20. 21 is located inside the region facing the underfloor inspection port 7.

  FIG. 7 is a partially exploded perspective view of the heat insulating structure 16 as viewed from the upper surface side. FIG. 8 is a partially exploded perspective view of the heat insulating structure 16 as viewed from the lower surface side. 7 and 8, the heat insulating structure 16 is divided into an upper heat insulating body 17 and a lower heat insulating body 18 in the vertical direction. The upper heat insulator 17 and the lower heat insulator 18 which are divided into two parts are stamped and joined together by fitting the stamping parts 17c and 18c formed on the outer periphery. An air supply path is formed inside the heat insulating structure 16 as described with reference to FIG. On this air supply path, a bell mouth 17b in which the blower 25 is installed and a maintenance space 17d in which the filter device 25 is installed are formed.

  In the maintenance space 17d, filter holding grooves 17a and 18a for guiding the filter device 10 when the filter device 10 is inserted and holding the filter device 10 in the maintenance space 17d are formed after the insertion. Further, a drain pan-like water retaining structure 33 is provided on the connection flange 14 side (upstream side) of the filter holding groove 18a at the bottom of the maintenance space 17d. The water retaining structure 33 collects water from mist and snow sucked together with the air supply, and evaporates when exposed to air. On the other hand, the inner side (downstream side) of the filter holding groove 18a is provided with a saucer portion 18d formed in a saucer shape, and the horizontal axis is provided up to the rotation axis of the sirocco fan 27, and is located at the sirocco fan inlet. The portion extending to the outer periphery of the suction R shape of the bell mouth 17d is an inclined surface 18b. Thereby, the favorable air supply path | route which distribute | circulates air supply is formed.

  In the heat insulating structure 16, the upper heat insulating member 17 and the lower heat insulating member 18, which are divided into two parts, are stamped and joined by fitting the stamping portions 17c and 18c to each other, so that the main body exterior portion is made of a steel plate or the like. However, the air supply path is well formed without causing air leakage. In addition, due to the action of the heat insulating structure 16, there may be a case where the heat insulating material attached to the outer peripheral portion in order to prevent dew condensation in winter can be eliminated in a relatively warm warm place. Moreover, even if it cannot be eliminated completely, the portion that requires heat insulating material can be extremely reduced.

  Next, a method for installing the air supply and blower 100 will be described with reference to FIG. A main body mounting bracket 35 having an L-shaped cross section is fastened to the remaining two lower side surfaces of the main body box 20 to which the connection flanges 14 and 15 are not attached. The main body mounting bracket 35 is fastened to the main body box 20 at the installation place at the time of construction. A vibration damping rubber 37 having a donut shape is attached to the main body mounting bracket 35, and is fixed to an installation place made of a concrete surface or the like by an anchor bolt that penetrates the vibration damping rubber 37.

  Next, a maintenance method for the air supply and blower 100 will be described with reference to FIGS. 4 and 5. The upper top plate 21 has a maintenance part (the motor 26 and the sirocco fan 27) of the blower 25 including the motor mounting plate 28a, the filter device 10, the rotary clamp within the range that fits in the opening hole of the underfloor inspection port 7 as described above. A maintenance cover 19 including an electrical connection 23 and an electrical wiring connection box 30 are disposed. In the case of maintenance of the air filter 12, the filter device 10 located at the center of the maintenance cover 19 is removed by pulling it vertically upward, and then the hinge portion of the filter frame 11 is removed from the filter frame 11 as shown in FIG. Remove the air filter 12. And dust etc. adhering to the air filter surface are removed by a vacuum cleaner or the like. If the air filter 12 is very dirty, replace it with a new air filter. Thereafter, the air filter 12 is housed in the filter frame 11 in the reverse procedure to the case of removal, and the filter frame 11 is inserted into the filter insertion opening 19a of the maintenance cover 19 and attached.

  Next, a method for cleaning dust and insects that have adhered to the filter frame 11 and dropped and accumulated inside the main body box 20 will be described. The frequency of cleaning is not as high as that of the air filter 12, but it is better to perform the cleaning twice a year, for example. The clamp 23 is rotated to remove the maintenance cover 19 above the upper top plate 21. At this time, the filter device 10 can be either removed from the maintenance cover 19 or attached. As a result, a cleaning opening 21 b appears in the upper top plate 21. Then, a nozzle such as a vacuum cleaner can be inserted from the cleaning opening 21b to suck and clean the water retaining structure 33 formed at the bottom of the maintenance space 17d and the dust and insects accumulated in the tray portion 18d.

  Next, maintenance of the blower 25 will be described. Specifically, the motor 26 of the blower 25 is replaced and the sirocco fan 27 is cleaned. The four fixing screws 28b fixing the motor mounting plate 28a to the upper top plate 21 are removed. Thereby, as shown in FIG. 5, the air blower 25 can be taken out vertically upward. The blower 25 is configured such that the motor 26, the sirocco fan 27, and the motor mounting plate 28a can be removed while being integrated. The work can be performed not as a high place work but as a simple work of removing the four fixing screws 28b in a state where the underfloor inspection port 7 provided in the floor 4 is opened. Generally, the blower 25 is heavy, but it can still perform maintenance work easily and safely. In addition, in the state which removed the air blower 25, it will be in the state which can see the bottom face part (receiving part 18d) of the lower heat insulator 18 from the suction inlet part of the sirocco fan 27 of the upper heat insulator 17. FIG. Therefore, by removing the blower 25, the inside of the air supply and blower 100 can be cleaned, in particular, dust and insects accumulated on the bottom surface of the lower heat insulator 18 can be sucked and cleaned.

In the air supply and ventilation system of the present embodiment, since the flow rate of the intake air supply near the outdoor opening 1 is kept low as described above, it is difficult to inhale dust, insects, and drizzle. Contamination in the first duct 2 is also reduced compared to the one. Therefore, the frequency of cleaning the inside of the duct, which is a troublesome work, can be reduced. For example, when the supply air volume is 150 m ³ / h and the inner diameter of the duct is 100 mm, the wind speed in the first duct 2 is about 5.3 m / S. On the other hand, when the duct inner diameter is 150 mm, it is reduced to about 2.4 m / S. In general, when the wind speed is 3 m / S or more, it becomes easy to suck insects and the like, and if it is less than this value, sucking of insects, drizzle, snow and the like can be suppressed.

  As described above, in the underfloor-mounted air supply and blower device 100 of the present embodiment, the maintenance portion of the blower 25, the filter device 10, and the electric wiring connection box 30 are the ceiling facing the underfloor inspection port 7 of the main body box 20. It is detachably provided in a region inside the floor inspection port 7 on the plate upper surface 21. Constructed in this way, the filter device 10 that requires relatively frequent maintenance is detachably disposed on the upper surface of the air supply and blower device 100 that is installed at a position that can be reached under the floor inspection port 7. Therefore, the filter device 10 can be easily and easily maintained. With this structure, the filter device 10 can be attached and detached by inserting / removing it directly upward from the underfloor inspection port 7, and dirt and dust adhering to the filter device 10 fall on the operator by this insertion / removal directly above. In addition, the filter device 10 can be attached and detached in a sanitary manner. Furthermore, since the upper surface of the air supply and blower device 100 to which the filter device 10 is detachably attached is installed under the floor that can be easily reached by indoor hands, the filter device can be easily and easily used even by an elderly person. Ten maintenances can be performed. As a result, it is possible to suppress a decrease in the air supply amount and an unhygienic environment due to bacteria, mold, etc. in the room. Moreover, since the maintenance part of the air blower 25 and the electrical wiring connection box 30 is also detachably disposed on the upper surface of the air supply air blowing device 100, the filter device 10, the air blower 25, and the electrical wiring connection box 30 can be provided from one underfloor inspection port 7. All maintenance can be performed.

  Moreover, since it is provided with the heat insulating structure 16 that is made of a foam heat insulating material and is housed in the main body box 20 and divided into two in the vertical direction to form an air supply path, the main body box 20 is satisfactorily provided. In addition to forming an air supply path, it is possible to reduce the amount of heat insulating material necessary as a countermeasure against cold.

  Furthermore, while covering the cleaning opening 21b for cleaning the main body box 20, the rotary clamp 23 (in the region inside the underfloor inspection port 7 of the top surface 21 facing the underfloor inspection port 7 of the main body box 20 is provided. It is provided with a maintenance cover 19 which is detachably provided by an engagement stop structure) and has a filter insertion port 19a into which a filter device 25 is inserted on the main surface. Therefore, a simple operation of removing the rotary clamp 23 is provided. The cleaning opening 21b can be exposed, and a nozzle such as a vacuum cleaner can be inserted from the cleaning opening 21b to facilitate the cleaning of the inside of the main body box 20, and the support structure of the filter device 25 can be simplified. Can do.

  Furthermore, the heat insulating structure 16 has filter holding grooves 17a and 18a for holding the filter device 25 in the maintenance space 17d on the air supply path, and a drain pan-like shape upstream of the filter holding grooves 17a and 18a. Since the water retaining structure 33 is formed, the filter device 25 can be easily held on the air supply path, and the water retaining structure 33 for collecting dust and insects can be provided on the upstream side of the filter device 25. Make it hygienic and easy to clean.

  The main body box 20 includes a lower box 22 made of a steel plate having a substantially box shape and having a flange at the opening, and an upper top plate 21 that closes the opening of the lower box 22. Therefore, the lower box body 22 made of steel plate and the upper top plate 21 can be manufactured by a saucepan process that does not require a mold, and only the heat insulating structure 16 made of polystyrene foam may be manufactured using a mold, and the polystyrene foam molding is performed. Because the mold cost is very low, the development cost can be kept low. Also, the blower part, the electrical wiring connection box part, and the filter frame part can be shared with another ventilation blower and can be used.

  In the present embodiment, the indoor air outlet 6 is installed on the floor 4 facing the indoor space S1, but the indoor air outlet 6 may be installed not on the floor 4 but on a low wall, for example, Although the second duct 3 may be piped up to the height of the wall surface, the second duct 3 needs to be heat-insulated on the outer peripheral portion to prevent condensation, or the heat-insulating duct needs to be used, so the work becomes complicated.

  As described above, the underfloor mounted air supply and blower according to the present invention is useful for an underfloor mounted air supply and blower that is installed in an underfloor space of a building and supplies air sucked from outside to the room. In particular, it is suitable for an underfloor-mounted air supply and blower device that requires ease of maintenance.

It is a systematic diagram of an air supply / air blowing system including an underfloor mounted air supply / air blowing device according to the present invention. It is the perspective view seen from the upper surface side of the heat insulation structure except the upper top plate of a floor-mounted air supply blower, and a lower box. It is the perspective view seen from the upper surface side of an underfloor attachment type supply air blower. It is a perspective view which shows the state which pulled out the filter apparatus from the main body box for the maintenance. It is a perspective view which shows the state which removed the filter apparatus, the motor, and the electrical wiring connection box from the main body box. It is a top view of an underfloor attachment type supply air blower. It is the partial exploded perspective view seen from the upper surface side of the heat insulation structure of an underfloor attachment type supply air blower. It is the partial exploded perspective view seen from the undersurface side of the heat insulation structure of an underfloor attachment type supply air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor opening 2 1st duct 3 2nd duct 4 Floor 6 Indoor blowout 7 Underfloor inspection port 9 Weather cover 10 Filter apparatus 11 Filter frame 12 Air filter 13 Cover plate 14,15 Connection flange 16 Thermal insulation structure 17 Upper thermal insulation 17a , 18a Filter holding groove 17b Bell mouth 17c, 18c Sealing part 17d Maintenance space 18 Lower heat insulator 18b Inclined surface 18d Sauce pan part 19 Maintenance cover 19a Filter insertion port 20 Body box 21 Upper top plate 21a Blower insertion port 21b Cleaning opening 21c Electrical wiring connection box mounting location 22 Lower box 23 Rotating clamp (engagement stop structure)
25 Blower 26 Motor (Blower Maintenance Department)
26a Motor lead 27 Sirocco fan (Blower maintenance part)
28a Motor mounting plate 28b Fixing screw 30 Electrical wiring connection box 32 Electrical wiring 33 Water retaining structure 35 Body mounting bracket 37 Anti-vibration rubber 100 Underfloor mounting type air supply and blower S1 Indoor space S2 Underfloor space S3 Ceiling back space S4 Outdoor space

Claims (4)

A floor-mounted air supply blower that is installed in an underfloor space of a building and supplies air sucked from outside to the room,
A main body box that is installed below the underfloor inspection port formed on the floor surface and forms an air supply path inside;
A blower that is provided in the air supply path and moves air supply in the air supply path, and a maintenance part is detachable from the main body box,
A filter device which is provided so as to cross the air supply path and filters the air supplied through the air supply path, and is detachable from the main body box;
The electrical wiring is stored, and the electrical wiring connection box is detachable from the main body box,
The maintenance portion of the blower, the filter device and the electrical wiring connecting box is detachably attached to the inner region of the underfloor inspection opening of the top plate upper surface which faces the floor access door of the main box body ,
A heat insulating structure that is made of a foam heat insulating material and is housed in the main body box and divided into two in the vertical direction to form the air supply path inside;
The heat insulating structure forms a filter holding groove for holding the filter device in the air supply path, and forms a drain pan-like water holding structure on the upstream side of the filter holding groove. Mounting air supply blower. Covering the cleaning opening for cleaning the main body box body, and detachably provided in the area inside the underfloor inspection port on the top plate facing the underfloor inspection port of the main body box body by an engagement stop structure The floor-mounted air supply and blower device according to claim 1, further comprising a maintenance cover having a filter insertion opening into which a filter device is inserted into a main surface. The underfloor mounting type air supply and blower device according to claim 2 , wherein the engagement stop structure for fixing the maintenance cover to the main body box is a rotary clamp. The main body box is composed of a lower box made of steel plate having a generally box shape and having a flange portion at the opening, and an upper top plate that closes the opening and has the top surface of the top plate. The underfloor mounting type air supply / air-blowing device according to any one of claims 1 to 3 .

Images